I spent a year or more of trying to get the hang of AutoCAD,, with almost zero success. I needed to do a City and Guilds college course in order to make significant progress, well two courses actually, one for 2D, and one for 3D. They then revoked my student licence for it, as I was no longer an accredited AutoCAD student (yes, you have to be an AutoCAD student, not just any old student) so it wouldn't work any more, and I used pirate copies for a bit, and then when Windows Vista stopped them working, I bought Turbocad. It seemed as if they had studied the Autocad manual and decided to make every single command incompatible with Autocad. I've now been farting about with it long enough I can do simple 2D stuff, but 3D in Turbocad still eludes me...
I think CAD software is designed to be non-intuitive!
(edited, so it wasn't utter gibberish)